Posted by Circuits Arena on Tuesday, 1 August 2017
Metal Detector Circuit using 555 Timer IC || Homemade Simple Metal Detector Circuit Diagram is the artlcle explaining Metal Detector Circuit using 555 Timer IC A metal detector is a common device used to check people, luggage or bags in shopping centers...
Metal Detector Circuit using 555 Timer IC
A metal detector is a common device used to check people, luggage or bags in shopping centers, hotels, cinemas, etc., to ensure that a person does not carry metal or illegal things, like cannons, bombs, etc. , The presence of metals.
You can find a metal detector at airports, theaters and various other public places. They are used for the safety of people to detect anyone carrying a metal. In this project we are going to design a simple metal detector circuit. There are so many metal detector designs but most of them are complex in design so here we are going to design a simple metal detector circuit using 555 Timer IC.
Circuit Diagram.
The figure shows a schematic diagram of the Metal Detector. IC 555 timer here acts as a generator and generates rectangular wave pulses with audible frequencies for humans. The capacitor between terminal 2 and terminal 1 should not be altered as necessary to generate the sound frequency.
Metal Detector Circuit Components:
In the circuit there is an RLC circuit formed by 47K resistor, 2.2µF capacitor, and 150turn inductor. This RLC circuit is the metal detection part. Now as mentioned earlier in previous section, a metal core inductor has a high inductance value over a air cored one.
Remember the coil wound here is a air cored one, so when a metal piece is brought near the coil, the metal piece acts as a core for the air cored inductor. By this metal acting as a core, the inductance of the coil changes or increases considerably. With this sudden increase in inductance of coil the overall reactance or impedance of the RLC circuit changes by a considerable amount when compared without the metal piece.
At first when there is no metal piece the signal fed to speaker causes some audible sound. Now with the reactance change around the RLC circuit the signal sent to speaker will no longer be the same as before, because of this the sound produced by the speaker will be of different to the first one.
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